Cardiff Council's 'Usual Suspects' campaign carries the message: "There's no excuse for dropping litter."
The anti-grime crackdown will focus on three main points:
- Dog fouling
- Fly tipping
The council's waste team is also telling dog owners there is a fine of £75 if caught not cleaning up after their dogs.
More top news
Wales are through to the Rugby World Cup quarter-finals after Australia beat England at Twickenham last night.
The Conservative's annual conference is getting underway in Manchester, and talk has turned to next year's Welsh election.
A band of showery rain will push through overnight, but it will feel mild.